Fix docker cp #20

andergnet · 2024-07-19T19:41:59Z

This pull request fixes issue #18

kolayne

Good evening! Sorry, I didn't notice the PR when you opened it and then didn't check my email for almost a week... 😭

But here I am :)

Firstly, thank you for the PR! There are some changes that I request below. Please, see my comments and let me know if I misunderstood something that you did intentionally.

Second, a general note (too late for this PR but may be useful for your future contributions): when your PR, while addressing a single problem, can be broken down into logical sub-steps, which you take to implement the patch, many maintainers prefer that you make a commit per step, so that your changes can be reviewed step by step as well. For example, I see two logical sub-steps of this PR: first, separate the existing code between driver.go and activemount.go, next, patch the multiple-mount logic.

Btw, providing detailed commit messages, answering the what&why questions ("what did you do? why did you do that?") is also beneficial and gives the reviewer an insight into your changes before they even starts reading your code!

UPD: on this page my comments are displayed in the order I created them, but it's better if you read them along with the code, in the order they appear in the Files changed section

kolayne · 2024-07-27T15:58:37Z

activemount.go

+		payload, _ := io.ReadAll(file)
+		json.Unmarshal(payload, &activeMount)
+		file.Close()


All three of these functions may return an error. In go, you usually want to check the error value when one is returned and handle it somehow. In some cases it makes sense to behave in one way or another when there's an error; in other cases the best you can do is just log the error and/or return it from your function (so the caller has to deal with it). Finally, in some (pretty rare) cases you indeed want to ignore an error value returned by a function. In such cases it's better to do this explicitly, e.g., _ = file.Close() rather than file.Close() and, perhaps, leave a comment, explaining, why it's ok to ignore an error here.

In your case:

The call to json.Unmarshal is supposed to set the value of activeMount, used further in the code. If an error occurs, what is the value of activeMount? It's probably either unaffected (that is, remains the default value, as of the declaration in the beginning of the function), or the value is unspecified (can be invalidated) - I'm not sure, we should check out the docs. So, if there is an error, it should definitely be handled, and, likely, lead to the failure to mount this volume (because its internal filesystem state became invalid).

The call to file.Close is much less important, and there isn't much we can do about it if an error occurs. But, firstly, problems with closing files may result in a file descriptor leak (although it's unlikely, as kernels try to release a descriptor early in the closing process), second, it may indicate an I/O problem, which a user would probably want to know about. So here I would prefer logging the error if it occurs, but continuing trying to activate the volume, unlike the previous case.

Finally, io.ReadAll in this particular context may be one of those cases when you can legitimately ignore an error! On the one hand, logs, presumably, would be more informative if you checked it, on the other hand, if there was an error in your io.ReadAll, then an error is bound to occur during json.Unmarshal as well because if io.ReadAll either couldn't read anything or only read the file partially, the result won't be a valid JSON dictionary (and your object corresponds to a dictionary), so unmarshalling will fail. Yet, this is not too obvious, so, if you choose to ignore the error here, you should leave a comment to explain why.

Btw, you can see some examples of documented functions in volumeTreeManagement.go. Ironically, all of them are unexported

Fixed: f6634d9

kolayne · 2024-07-27T16:08:41Z

activemount.go

+
+func (d *DockerOnTop) Activate(request *volume.MountRequest, activemountsdir lockedFile) (bool, error) {
+	var activeMount ActiveMount
+	var result bool


Could we make this name more informative?

Since this was an issue also in driver.go (see comment), I have named it the same way everywhere: 1985b52

kolayne · 2024-07-27T16:09:34Z

activemount.go

+}
+
+func (d *DockerOnTop) Activate(request *volume.MountRequest, activemountsdir lockedFile) (bool, error) {
+	var activeMount ActiveMount


It could be declared closer to its usage, making it easier to read the code

Fixed 7043a09

kolayne · 2024-07-27T16:13:05Z

activemount.go

+	} else {
+		log.Errorf("Active mount file %s exists but cannot be read.", activemountFilePath)
+		return false, fmt.Errorf("active mount file %s exists but cannot be read", activemountFilePath)
+	}


That's too little information: we have an error err and could've told what actually happened. See the doc for fmt.Errorf, in particular, its %w verb.

I can see you both log an error and return it. The messages are very similar but slightly different (in case and punctuation). Is that intended? As there are several places like this, would it make sense to only return an error here, and then log it from the caller?

I have applied the suggestions as they do make good sense. As if it was intended, the case and punctuation changes they were, initially they where the same with human readable format (casing and sentence ending dots) but the linter complained about that format on the error message. That's how it ended up like this.

c57da77
f9aadb4

kolayne · 2024-07-27T16:14:14Z

activemount.go

+
+	activeMount.UsageCount++
+
+	payload, _ := json.Marshal(activeMount)


The error is ignored explicitly but it's not clear to me why. json.Marshal's behavior should be much more predictable than that of json.Unmarshal, so it's probably safe to ignore the error here, but, please, write a comment explaining why, relying on the documentation of json.Marshal

it's not clear to me why. json.Marshal's behavior should be much more predictable than that of json.Unmarshal
We have control over what the Marshal-ed structure (activeMount) so we will not get suprises there. Unmarshal, on the other hand, deals with a file in the filesystem and we could have a surprise if someone changes it.

I have added a comment to indicate why it is safe to ignore the error, which basically boils down to the fact that there is no room for error when converting an structure containing a single integer to JSON.
03f2054

kolayne · 2024-07-27T16:30:20Z

driver.go

-	if errors.Is(readDirErr, io.EOF) {
-		// No files => no other containers are using the volume. Need to mount the overlay
-
+	mount, err := d.Activate(request, activemountsdir)


It's not clear to me what kind of value the boolean variable mount holds here. Is there a better name for this?

Is it an instruction for us returned by d.Activate, i.e., pleaseMount/doMount?

Changed to doMountFs also to differenciate between the two meanings of "Mount".
1985b52

kolayne · 2024-07-27T16:44:33Z

activemount.go

+			log.Errorf("The active mount file %s could not be deleted", activemountFilePath)
+			return false, fmt.Errorf("the active mount file %s could not be deleted", activemountFilePath)


Same two points as for a similar error handling earlier.

Plus! As I can see, the behavior here is significantly different from that of previous docker-on-top. As I can see, this branch is handling the case when we are supposed to actually unmount volume and remove the mount file but failing to remove the file.

One thing you've changed is the order: you're first trying to remove the file, and then, on success, attempt to unmount the overlay (unlike the previous code which attempted it the other way around). And that's for the better! In the old version, if an error occurred during the file deletion, this would bring the volume in a very bad state (overlay is not actually mounted but it looks like it is, so other containers will try to use it straight away - expect horrible bugs); with this change, if an error occurs during the file deletion, the volume is in a just bad state (the volume looks like it's used, although it's not, but it's at least properly mounted).

The other thing you've changed is the logging level: it used to be log.Criticalf, you changed it to log.Errorf. If you think of it, that probably makes sense too, given the above.

So, actually, no problem that I first thought of when starting the "Plus!" part. Good job! But I would still add something to this error message, something like "this volume will never get unmounted until a reboot"

I'm not really convinced with the new text either, if you have a suggestion please do not hesitate to propose.
Now that the log messages are handled in driver.go, i would keep all of them as Errorf and not Criticalf for the sake of simplicity and the fact that I do not consider the errors more severe.
e441320

kolayne · 2024-07-27T17:04:44Z

driver.go

-			"manually to fix the problem", err)
+		log.Debugf("Unmounted volume %s", request.Name)
+	} else {
+		log.Debugf("Volume %s is still mounted. Indicating success without unmounting", request.Name)


I don't agree with the error message change here. Here, you're seemingly saying "still mounted so I'm not unmounting it", which doesn't make sense. That's because of the ambiguity between "mounted" as in "a container is running where this volume is used" and "mounted" as in "the underlying overlay filesystem is present". IMO, the previous error message was clearer:

log.Debugf("Volume %s is still mounted in some other container. Indicating success without unmounting", request.Name)

Maybe could be phrased even better, e.g., Volume %s is still used in another container. Indicating success without unmounting

I like the one you proposed, it's more clear of what's happening:
197c6fe

kolayne · 2024-07-27T17:19:52Z

activemount.go

+	UsageCount int
+}
+
+func (d *DockerOnTop) Activate(request *volume.MountRequest, activemountsdir lockedFile) (bool, error) {


A comment on both DockerOnTop.Activate and DockerOnTop.Activate:

Their names probably don't quite reflect what they do. If I saw the following piece of code:

var d DockerOnTop = ... d.Activate(...)

I would most probably assume that d.Activate activates the d object (whatever it could mean) because that's what the name suggests. But what it actually does is it activates a volume. If we had a proper volume object, it would make sense to move this method there and have volume.Activate, but as its a method of DockerOnTop, its name should probably be ActivateVolume

In go, the case of the first letter (i.e., whether it's lowercase or uppercase) has a semantic effect: if an entity name is capitalized, it's exported (i.e., public - available from other packages), otherwise it's unexported (i.e., private, only available in this package). As I understand, the .Activate and .Deactivate are both intended for internal use only (a caller external to DockerOnTop shall not call them directly). If that's the case, their names should be changed.

If I'm wrong and you intended that these functions are exported, it's a go convention to have a documentation string for every exported entity (see Documenting go code for details). You may notice that other exported methods of DockerOnTop don't have documentation, which is a flaw, but all of them correspond to Docker API calls, whereas the two new functions you are adding are something new.

Finally, as you may notice in further comments, at some points it wasn't clear to me what these functions should do and, especially, what they should return. That's why, even if you didn't mean to export them and you'll rename them to .activateVolume and .deactivateVolume respectively, they would still benefit from a short docstring that explains what they do and what they return.

I hope this looks better now with the changes I have done:
Commit: b18043e

Also commit 3a67652 since I didn't properly rename deactivateVolume

kolayne · 2024-07-27T17:20:26Z

activemount.go

+	"github.com/docker/go-plugins-helpers/volume"
+)
+
+type ActiveMount struct {


You probably meant to call it activeMount (see point 2 of the next note, on exporting entities in go).
(note that unlike the structure, its field should be exported: otherwise json.Marshal/.Unmarshal won't be able to access it, as they are not part of this package)

It's my first real program in Go, I had no idea about that, I simply copied how VolumeInfo was defined. I have fixed it.
e55a292

kolayne · 2024-07-27T18:46:31Z

driver.go

+	} else if mount {
 		lowerdir := thisVol.BaseDirPath
 		upperdir := d.upperdir(request.Name)
 		workdir := d.workdir(request.Name)


Read this comment first.

Here you, unfortunately, did kind of the opposite (similarly, you reversed the original order, but it has the inverse effect in this case).

Combining the logic inside d.Activate and the code below this comment up to and including the syscall.Mount (that's the code you did not modify), the overall (new) logic is as follows:

Check if the volume is already mounted based on activemount files. If it's not:

Create a new activemount file to indicate that I am the user of the volume [may fail]

Perform the actual mount of the overlay [may fail]

Now, imagine the file creation step succeeds but the next one fails. For that container, of course, we'll report the error and it will refuse to start, but the volume ends up in a very bad state. If another container tries to use that same volume, it will perform the same steps above, but in the first one it will find an activemount file from the previous container and will assume that the volume is already mounted, while it in fact is not!!

The reverse order is not very good either but slightly better: if the first container manages to mount the volume but doesn't manage to mark it as mounted, it, likewise, won't let the current container start (so that overlay mount remains unused), then, when the next container attempts a mount, it will run the same steps and, in the trickiest case, will just mount the same overlay on top of the old one and start using it (which is weird because there are two overlays mounted simultaneously using the same internal directories, but should be ok, as the first overlay is never used, being shadowed by the new one).

So,

First possible improvement for your code: your implementation should at least emit a scary screaming error!
(see examples from the old code - errors used in very similar situations: 1, 2)

Second, it would be much better if you could fix things such that the order of the system calls (mount/unmount call and activemount file creation/deletion call) is old (as in my code) for the Mount operation but is new (as in your code) for the Unmount operation.

In fact, I now see how we could improve the Mount part, so that we never even attempt to mount overlay on top of anything old. Of course, this is out of scope of this PR, so I'll create a separate issue (but it still requires that you restore the old order here in Mount)

I have improved the way Mount function works, I keep the new order but in case the filesystem mount fails it will undo the activemount creation so it returns the function in a consistent state: filesystem not mounted and no activemount present.

01de48d

…d. Change the variable names already using the activeMount name

… respectively. Also add a docstring for them.

… a previous commit

…he activateVolume and deactivateVolume functions

…hange

…n Docker structures. This way we can call them without an actual request.

andergnet · 2024-07-29T21:03:50Z

@kolayne I think I have addressed all the issues you raised in the review. Could you please review it again?

I tried to be more transparent and show every step of the way but I'm not used to do it, so my apologies if you expected something different.
I won't have access to a proper computer for a few weeks, don't worry if I do not answer I'll do it when I'm back.

kolayne

Nice! Here are some more things to fix

kolayne · 2024-07-31T08:55:44Z

activemount.go

+		// The directory is empty, mount the filesystem
+		doMountFs = true
+	} else {
+		return false, fmt.Errorf("failed to list activemounts/ %v", readDirErr)


Suggested change

return false, fmt.Errorf("failed to list activemounts/ %v", readDirErr)

return false, fmt.Errorf("failed to list activemounts/ : %w", readDirErr)

kolayne · 2024-07-31T09:00:22Z

activemount.go

+		} else if closeErr != nil {
+			return false, fmt.Errorf("active mount file %s has been opened but cannot be closed %w", activemountFilePath, readErr)
+		}


Failing to close a file is bad enough to emit a warning but I don't think it's bad enough to abort the operation (if we read the contents successfully, there's no problem to continue). I'd do something like:

if err := file.Close(); err != nil { log.Warningf("Failed to close active mount file: %v", err) }

I have replaced everything with a os.ReadFile

kolayne · 2024-07-31T09:06:19Z

activemount.go

+	file, err := os.Open(activemountFilePath)
+
+	if err == nil {
+		// The file can exist from a previous mount when doing a docker cp on an already mounted container, no need to mount the filesystem again
+		payload, readErr := io.ReadAll(file)
+		closeErr := file.Close()


I just noticed we open the file and then on success just read all contents of it and close it. Looks just like os.ReadFile. Can we use it here?

Fun fact: Go's standard library ignores the error returned by file.Close() inside os.ReadFile

I have replaced everything with a os.ReadFile.

I have never seen a close() function fail, but it's true that I have worked more on Windows than Linux.

kolayne · 2024-07-31T09:08:26Z

activemount.go

+		unmarshalErr := json.Unmarshal(payload, &activeMountInfo)
+		if unmarshalErr != nil {


No big deal but looks a bit too verbose to me. Could be

if err := json.Unmarshal(...); err != nil { do stuff }

If you don't have strong feelings about it I'll keep it the way it is with a single instruction per line, I find it better specially when debugging.

kolayne · 2024-07-31T09:19:06Z

activemount.go

+// Parameters:
+//
+//	requestName: Name of the volume to be mounted
+//	requestID: ID of the container requesting the mount


Factual error: reuqestID is not a container id (which you see, e.g., in docker container ls). In fact, it is some id generated for the pair {container, volume}. The doc doesn't necessarily need to be this specific, but it should not lie either.

I would call it either "a container-volume-unique ID" or, more elaborate, "an ID unique among volumes and containers but the same value if a volume is mounted for a container twice". Maybe can be phrased better.

Please, also fix the same thing in deactivateVolume

Done. I thought I checked it, but apparently not.

kolayne · 2024-07-31T09:37:25Z

activemount.go

+	if activeMountInfo.UsageCount == 0 {
+		err := os.Remove(activemountFilePath)
+		if err != nil {
+			return false, fmt.Errorf("the active mount file %s could not be deleted %w, the filesystem won't be unmounted", activemountFilePath, err)


For consistency with an earlier error, indicating action ("unmounting" / "refusing to unmount")

Suggested change

return false, fmt.Errorf("the active mount file %s could not be deleted %w, the filesystem won't be unmounted", activemountFilePath, err)

return false, fmt.Errorf("the active mount file %s could not be deleted: %w. Refusing to unmount", activemountFilePath, err)

Instead of changing all messages saying "the filesystem won't be unmounted" I changed the first one that said "Unmount" to "the filesystem will be unmounted (which now is a warning).

kolayne · 2024-07-31T09:41:08Z

activemount.go

+		payload, _ := json.Marshal(activeMountInfo)
+		err = os.WriteFile(activemountFilePath, payload, 0o644)
+		if err != nil {
+			return false, fmt.Errorf("the active mount file %s could not be updated %w, the filesystem won't be unmounted", activemountFilePath, err)


Suggested change

return false, fmt.Errorf("the active mount file %s could not be updated %w, the filesystem won't be unmounted", activemountFilePath, err)

return false, fmt.Errorf("the active mount file %s could not be written: %w. Refusing to unmount", activemountFilePath, err)

same as previous.

kolayne · 2024-07-31T09:45:04Z

driver.go

-
+	doMountFs, err := d.activateVolume(request.Name, request.ID, activemountsdir)
+	if err != nil {
+		log.Errorf("Error while activating the filesystem mount: %w", err)


%w is a feature of fmt.Errorf only, when you want to create an error object. As log.Errorf just prints something, rather than creating an object, it uses fmt.Sprintf under the hood, which will either silently interpret %w as %v, or will display some warning or something. In any case,

Suggested change

log.Errorf("Error while activating the filesystem mount: %w", err)

log.Errorf("Error while activating the filesystem mount: %v", err)

Done this one and another one in line 250.

kolayne · 2024-07-31T09:50:13Z

driver.go

+		if err != nil {
+			// The filesystem could not be mounted so undo the activateVolume call so it does not appear as if
+			// we are using a volume that we couln't mount. We can ignore the doUnmountFs because we know the volume
+			// is not mounted.


TODO for me: I will look into it more carefully some time later

kolayne · 2024-07-31T09:52:17Z

driver.go

+	if err != nil {
+		log.Errorf("Error while activating the filesystem mount: %w", err)
+		return internalError("failed to deactivate the active mount:", err)
+	} else if doUnmountFs {


Oh-oh! From what I can see in the code of .deactivateVolume, it seems like you want this code to take actions for doUnmountFs == true even when err != nil! Am I right?

You are right, I did not notice there was a case returning true + error. I have changed it to log a warning instead and return true + nil

andergnet · 2024-08-21T20:34:47Z

I'm back!

I think I have addressed all the issues you raised, please review again.

I know it's all in a single commit, sorry, it's an old habit, and by the time I noticed I had most of the changes already done.

PS: The newline after the "Parameters" and "Return" in the docstring it's not me, the linter automatically adds it every time I save.

kolayne · 2024-08-21T20:38:13Z

I'm back!

Top!

I think I have addressed all the issues you raised, please review again.

Hopefully, I'll be able to by the end of the week

I know it's all in a single commit, sorry, it's an old habit, and by the time I noticed I had most of the changes already done.

No problem. This mostly matters at the beginning when I'm trying to understand what's the patch about in general. When the comments are addressed, I don't look into them one by one anyway.

kolayne · 2024-11-07T19:38:46Z

Hey, @andergnet!

I've found myself pretty busy with other stuff... So I don't really know when I'm going to get to merge this. That's somewhat untrivial, as I want to first merge some tests checking for some edge-case behaviors, and then merge your PR, making sure those tests pass (right now there's one scenario that is broken in master but, hopefully, with your PR, we can fix even that).

Yesterday I've made a step forward towards that, but I'm not quite there yet, and, given the experience of the last two months, I don't dare to try to estimate when I will have time to finish this.

But! I want to let you know that

Most likely, I won't request any more changes from you seem to have already done the core thing, and should there be minor issues, I can fix them myself;
I appreciate your attention to the project in general, and, in particular, the contribution with both the bug report and this workaround patch; and
Of course, sooner or later, this will definitely be merged!

andergnet · 2024-11-07T20:29:05Z

Hi @kolayne
Glad to hear back from you, I was wondering what happened to you since you disappeared after being quite engaged in the topic, no complains, I just hope you are doing alright (I have a job and two daughters, I understand being busy for side projects like this).

About the MR being delayed, no problem on my side, it's your project, your rules ;-). Just let you know that I have been using docker-on-top in the last few months with the patch and I haven't run into any issues.

Till next time :-)

Fix docker cp

bb0d010

kolayne requested changes Jul 27, 2024

View reviewed changes

kolayne linked an issue Jul 27, 2024 that may be closed by this pull request

docker cp not working properly #18

Open

kolayne reviewed Jul 27, 2024

View reviewed changes

AnderG added 16 commits July 28, 2024 22:09

Rename ActiveMount to activeMount as it is not intended to be exporte…

e55a292

…d. Change the variable names already using the activeMount name

Rename Activate and Deactivate to activateVolume and deactivateVolume…

b18043e

… respectively. Also add a docstring for them.

Declare activeMountInfo closer to it's usage

7043a09

Refactor activemountFilePath definition and surrounding lines

c0d28c0

Safely ignore json.Marshal errors

03f2054

Reduce activeMount file permissions

0764601

Rename returning variables for activateVolume and deactivateVolume

1985b52

Rename DeactivateVolume to deactivateVolume as it should have been in…

3a67652

… a previous commit

Remove log messages from activemount and place them in the calls to t…

c57da77

…he activateVolume and deactivateVolume functions

Extend error information on activateVolume and deactivateVolume

f9aadb4

Improve log message when the filesystem needs no unmounting

38424e8

Improve log message when the filesystem needs no unmounting. Actual c…

197c6fe

…hange

Improve error handling when reading from the activemount file

f6634d9

Indicate on unmount errors that the filesystem won't be unmounted

e441320

Change activateVolume and deactivateVolume parameters not to depend o…

149fe1a

…n Docker structures. This way we can call them without an actual request.

Improve Mount error mangement

01de48d

kolayne requested changes Jul 31, 2024

View reviewed changes

kolayne and others added 2 commits July 31, 2024 12:54

Minor docs/comments/error-messages fixes

ebe57ea

Fix issues raised in the review

10b7f9c


		activeMount.UsageCount++

		payload, _ := json.Marshal(activeMount)

		log.Errorf("The active mount file %s could not be deleted", activemountFilePath)
		return false, fmt.Errorf("the active mount file %s could not be deleted", activemountFilePath)

	return false, fmt.Errorf("failed to list activemounts/ %v", readDirErr)
	return false, fmt.Errorf("failed to list activemounts/ : %w", readDirErr)

		unmarshalErr := json.Unmarshal(payload, &activeMountInfo)
		if unmarshalErr != nil {

	log.Errorf("Error while activating the filesystem mount: %w", err)
	log.Errorf("Error while activating the filesystem mount: %v", err)

Fix docker cp #20

Are you sure you want to change the base?

Fix docker cp #20

Conversation

andergnet commented Jul 19, 2024

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andergnet commented Aug 21, 2024

kolayne commented Aug 21, 2024

kolayne commented Nov 7, 2024

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